Terminal Designations; Wiring - Honeywell 9000 Installation Manual

Wiring

Terminal
release
Remove
jumper loop
ONLY if you
have both
R and Rc
wires.

Terminal Designations

C
Common wire from secondary side of cooling transformer (if 2 transformers).
K
Optional wirer save module.
Rc
Cooling power. Connect to secondary side of cooling system transformer.
R
Heating power. Connect to secondary side of heating system transformer.
W-O/B 1st stage heat relay. Or changeover valve for heat pumps.
Y 1st stage compressor contactor.
G
Fan relay.
W2-Aux/E
2nd stage heat relay. Or heat pump auxiliary/Emergency heat relay.
Y2
2nd stage compressor contactor.
L
Heat pump system monitor.
Jumper Loop, a plug with a wire loop used to connect the R to the Rc terminals,
Leave jumper loop in place in single transformer systems. Remove (unplug) jumper
loop in two transformer systems.
3
Terminal
holes accept
one wire
MCR34820
69-2815EFS—01